.count-down {
  text-align: center;
  .title {
    font-size: 24px;
  }
  .time-out {
    height: 24px;
    line-height: 24px;
    font-size: 18px;
    margin: 10px;
    span {
      font-size: 20px;
      padding-left: 10px;
      color: red;
      font-weight: bold;
    }
  }
  .option-div {
    text-align: center;
    overflow: auto;
    .card {
      float: left;
      width: 24px;
      height: 24px;
      line-height: 24px;
      text-align: center;
      font-size: 10px;
      cursor: pointer;
      position: relative;
      border: 1px solid #c0c0c0;
    }
    .choose{
      background: #c0c0c0;
    }
  }
  .commit-div{
    margin-top: 20px;
  }
}

.exam-content{
  border: 1px solid #c0c0c0;
  padding: 20px;
  border-radius: 8px;
  position: relative;
  .title{
    position: absolute;
    top: -12px;
    left: 10px;
    background: #ffffff;
    padding: 0 10px;
  }
  .btn-div{
    text-align: center;
    padding-top: 16px;
    border-top: 1px solid #f8f8f8;
    .next-prev-div{
      padding: auto 10px;
    }
  }
  .content-div{
    margin: 20px auto;
    .option-content{
      height: 26px;
      line-height: 26px;
    }
  }
}